[time-nuts] femtosecond jitter

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Apr 13 22:06:30 EDT 2018


Thus a DDMTD using NB7V52's as the mixers should have useful performance

Bruce 
> On 14 April 2018 at 03:54 John Larkin <jjlarkin at highlandtechnology.com> wrote:
> 
> 
> If you walk the differential data and clock inputs of an NB7V52  CML 
> flipflop across one another in time, the equivalent jitter is below 20 
> fs RMS. That's what we're measuring, but our test rig may well dominate 
> the jitter, so the flop is probably better.
> 
> We're using this to test the jitter of some of our timing products, with 
> 1/10 the noise floor and 1e-4 times the cost of other ways to do it.
> 
> https://www.dropbox.com/s/1i2yz7otty94o9l/NB7_Jitter_1.jpg?raw=1
> 
> https://www.dropbox.com/s/qahpb8uh1xr53vj/NB7_Steps.jpg?raw=1
> 
> https://www.dropbox.com/s/tpphhi79yxgzy34/NB7_tc.jpg?raw=1
> 
> 
> -- 
> ********************************** arb
> 
> John Larkin, President
> Highland Technology, Inc
> 18 Otis Street
> San Francisco, CA 94103
> 
> phone 415 551-1700   fax 551-5129
> jjlarkin at highlandtechnology.com
> http://www.highlandtechnology.com
> 
> This is a Highland Technology confidential communication
> 
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